[PATCH] [BZ #2749] soft-fp fixes, update

[Steven Munroe]

I updated this patch to current glibc cvs trunk and move fenv-libc.h to  sysdeps/powerpc/nofpu/ as suggested by Jakub.

It is clear that rounding a inf or NAN makes no sense and is wasted effort, so I left the 
_FP_PACK_SEMIRAW patch unchanged.

This patch corrects functional issues we found in the soft-fp implementation that are common to all arches using soft-fp. We need to get these patches into libc trunk, so we can migrate them into the soft-fp implementation of gcc mainline.

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